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> > That makes digital signature and non-repudiable disclosure impossible:
> > each party could claim the other signed or exposed the data.
You need a bit more than just digital sigs using public key (asymmetrical)
cryptography to provide non-repudiation capability, though the encryption is a prereq.
Persistent storage of transactions is also a must (typically at both trading partner
ebXML Message Service Handler (MSH) is a good solution if you need such
things...web services specs are not there yet and won't be for a while yet.